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A187139 Number of (n+1)X9 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
1731321, 1908891288, 658156407930, 301728175130790, 127632346709629266, 56423240969024815416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A187140

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 4X9

..1..1..0..0..2..1..2..1..2....1..1..0..0..0..0..2..2..2

..0..0..0..0..0..1..2..0..1....0..0..0..0..0..1..1..0..0

..0..0..0..1..0..0..0..0..2....0..0..0..1..0..0..0..0..1

..0..0..0..1..0..1..1..0..0....0..0..0..1..0..1..0..0..0

CROSSREFS

Sequence in context: A157862 A186586 A131639 * A185844 A234130 A177695

Adjacent sequences:  A187136 A187137 A187138 * A187140 A187141 A187142

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 05 2011

STATUS

approved

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Last modified November 17 16:08 EST 2019. Contains 329241 sequences. (Running on oeis4.)